Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
trang xa » trang va, trang ha, trang tai
doan van » doan va, hoang van, luan van
trong xa » trong xay, trong ca, trong xu
danh vai » danh sai, danh va, doanh van
su sach » so sach, vu sach
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((trang xa) or (trong xa)) hoi. hieu ve tham thuc va ((danh vai) or (doan van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((trang xa) OR (trong xa)) hoi. hieu ve tham thuc va ((danh vai) OR (doan van)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((trang xa) or (trong xa)) hoi. hieu ve tham thuc va ((danh vai) or (doan van)) cuu tre*.